we see sasha with him, who yesterday told him, he didn't mess up. at the other -- malia will be coming in soon. i think we're all struck at the difference in four years, as we look at them. and remembering that four years ago, at this moment, the president had just been released the nuclear codes. in the white house, they were scrambling to put toys on the beds for the girls, organizing a scavenger hunt to find their ways around. >> today, after the ceremony, they'll just be going home. it's been their home for the last four years. the president's family getting into the limousines. i want to go to pierre thomas. on the big, national days, we're also concerned. we have to have all of our thoughts, also, on the issue of security. pierre? >> reporter: george, as the big crowd makes its way to the mall, these are the most stressful moments for the authorities. as a result, we have more than 13,000 military and law enforcement personnel, ready for this event. we have snipers on the roofs. we have biological and chemical units prepared to deal with whate